18 watts fast charge. This phone was launched in 2018. It is also the first iPhone to support fast charging mobile phones, although the random charging head does not support fast charging, but the purchase of the related fast charging head can still be fast charging, it is 9 volts 2 ampere 18 watts charger support pd charging protocol can give it fast charging, fast charging then generally within an hour can be fully charged.
The Apple x supports 18W fast charge
The iPhoneX Fast Charge uses the USB PD charging protocol, and Apple is one of the members of the charging protocol alliance. At this stage, Apple's official chargers that can be used by the iPhoneX to support fast charging have five USB-C interfaces: Apple 18W, 29W, 30W, 61W and 87W.